820-00165-A MacBook Air not working on battery after water damage

[Rez Razmi]

I have a MacBook Air with water damage. There was some corrosion on the logicboard. I cleaned the board with ultrasonic and it's turning on and working when the charger is connected. I test it with a new battery as well but as soon as I disconnect the charger it turns off. when it turns on the lid it shows the battery has 96% charge.
any advice which area should I look for?

 

[2informaticos]

Post PPBUS_G3H and 3V42_G3H voltage with only battery connected.

For the future, start new thread posting 820-xxxxx code of your board...

 

[Rez Razmi]

thanks for the reply. changed the title. I checked PPBUS_G3H and I'm getting 8.6V
3V42_G3H I,m getting 3.4V .

Please check the image below. there are some visible signs but I'm getting 3.4V

 

[2informaticos]

Resolder affected components; may need to replace something.
Post exact ohm resistance between pins 17/18 and 27/28 of U7100.

"I checked PPBUS_G3H and I'm getting 8.6V"
Go back and read my post again.
Did you ever see a battery with 8.6V???

 

[Rez Razmi]

pins 17/18 20 ohm

27/28 of U7100 19.2 ohm

 

[Rez Razmi]

resoldered the affected components and replaced the C7126 and it's working fine now

 

[2informaticos]

"pins 17/18 20 ohm"
Remember to get 2-3 ohm in the future.
Was exactly on the most corroded area...